037e874458
(arm_it): Add uncond_value field. Add isvec and issingle to operand array. (arm_reg_type): Add REG_TYPE_VFSD (single or double VFP reg) and REG_TYPE_NSDQ (single, double or quad vector reg). (reg_expected_msgs): Update. (BAD_FPU): Add macro for unsupported FPU instruction error. (parse_neon_type): Support 'd' as an alias for .f64. (parse_typed_reg_or_scalar): Support REG_TYPE_VFSD, REG_TYPE_NSDQ sets of registers. (parse_vfp_reg_list): Don't update first arg on error. (parse_neon_mov): Support extra syntax for VFP moves. (operand_parse_code): Add OP_RVSD, OP_RNSDQ, OP_VRSDLST, OP_RVSD_IO, OP_RNSDQ_RNSC, OP_RVC_PSR, OP_APSR_RR, OP_oRNSDQ. (parse_operands): Support isvec, issingle operands fields, new parse codes above. (do_vfp_nsyn_mrs, do_vfp_nsyn_msr): New functions. Support VFP mrs, msr variants. (do_mrs, do_msr, do_t_mrs, do_t_msr): Add support for above. (NEON_ENC_TAB): Add vnmul, vnmla, vnmls, vcmp, vcmpz, vcmpe, vcmpez. (NEON_ENC_SINGLE, NEON_ENC_DOUBLE): Define macros. (NEON_SHAPE_DEF): New macro. Define table of possible instruction shapes. (neon_shape): Redefine in terms of above. (neon_shape_class): New enumeration, table of shape classes. (neon_shape_el): New enumeration. One element of a shape. (neon_shape_el_size): Register widths of above, where appropriate. (neon_shape_info): New struct. Info for shape table. (neon_shape_tab): New array. (neon_type_mask): Add N_F64, N_VFP. Update N_MAX_NONSPECIAL. (neon_check_shape): Rewrite as... (neon_select_shape): New function to classify instruction shapes, driven by new table neon_shape_tab array. (neon_quad): New function. Return 1 if shape should set Q flag in instructions (or equivalent), 0 otherwise. (type_chk_of_el_type): Support F64. (el_type_of_type_chk): Likewise. (neon_check_type): Add support for VFP type checking (VFP data elements fill their containing registers). (do_vfp_cond_or_thumb): Fill in condition field in ARM mode, or 0xE in thumb mode for VFP instructions. (do_vfp_nsyn_opcode): New function. Look up the opcode in argument, and encode the current instruction as if it were that opcode. (try_vfp_nsyn): New. If this looks like a VFP instruction with ARGS arguments, call function in PFN. (do_vfp_nsyn_add_sub, do_vfp_nsyn_mla_mls, do_vfp_nsyn_mul) (do_vfp_nsyn_abs_neg, do_vfp_nsyn_ldm_stm, do_vfp_nsyn_ldr_str) (do_vfp_nsyn_sqrt, do_vfp_nsyn_div, do_vfp_nsyn_nmul) (do_vfp_nsyn_cmp, nsyn_insert_sp, do_vfp_nsyn_push) (do_vfp_nsyn_pop, do_vfp_nsyn_cvt, do_vfp_nsyn_cvtz): New functions. Redirect Neon-syntax VFP instructions to VFP instruction handlers. (do_neon_dyadic_i_su, do_neon_dyadic_i64_su, do_neon_shl_imm) (do_neon_qshl_imm, do_neon_logic, do_neon_bitfield) (neon_dyadic_misc, neon_compare, do_neon_tst, do_neon_qdmulh) (do_neon_fcmp_absolute, do_neon_step, do_neon_sli, do_neon_sri) (do_neon_qshlu_imm, neon_move_immediate, do_neon_mvn, do_neon_ext) (do_neon_rev, do_neon_dup, do_neon_rshift_round_imm, do_neon_trn) (do_neon_zip_uzp, do_neon_sat_abs_neg, do_neon_pair_long) (do_neon_recip_est, do_neon_cls, do_neon_clz, do_neon_cnt) (do_neon_swp): Use neon_select_shape not neon_check_shape. Use neon_quad. (vfp_or_neon_is_neon): New function. Call if a mnemonic shared between VFP and Neon turns out to belong to Neon. Perform architecture check and fill in condition field if appropriate. (do_neon_addsub_if_i, do_neon_mac_maybe_scalar, do_neon_abs_neg) (do_neon_cvt): Add support for VFP variants of instructions. (neon_cvt_flavour): Extend to cover VFP conversions. (do_neon_mov): Rewrite to use neon_select_shape. Add support for VFP vmov variants. (do_neon_ldr_str): Handle single-precision VFP load/store. (do_neon_ld_st_interleave, do_neon_ld_st_lane, do_neon_ld_dup): Use NS_NULL not NS_IGNORE. (opcode_tag): Add OT_csuffixF for operands which either take a conditional suffix, or have 0xF in the condition field. (md_assemble): Add support for OT_csuffixF. (NCE): Replace macro with... (NCE_tag, NCE, NCEF): New macros. (nCE): Replace macro with... (nCE_tag, nCE, nCEF): New macros. (insns): Add support for VFP insns or VFP versions of insns msr, mrs, vsqrt, vdiv, vnmul, vnmla, vnmls, vcmp, vcmpe, vpush, vpop, vcvtz, vmul, vmla, vmls, vadd, vsub, vabs, vneg, vldm, vldmia, vldbdb, vstm, vstmia, vstmdb, vldr, vstr, vcvt, vmov. Group shared VFP/Neon insns together.
README for GAS
A number of things have changed since version 1 and the wonderful
world of gas looks very different. There's still a lot of irrelevant
garbage lying around that will be cleaned up in time. Documentation
is scarce, as are logs of the changes made since the last gas release.
My apologies, and I'll try to get something useful.
Unpacking and Installation - Summary
====================================
See ../binutils/README.
To build just the assembler, make the target all-gas.
Documentation
=============
The GAS release includes texinfo source for its manual, which can be processed
into `info' or `dvi' forms.
The DVI form is suitable for printing or displaying; the commands for doing
this vary from system to system. On many systems, `lpr -d' will print a DVI
file. On others, you may need to run a program such as `dvips' to convert the
DVI file into a form your system can print.
If you wish to build the DVI file, you will need to have TeX installed on your
system. You can rebuild it by typing:
cd gas/doc
make as.dvi
The Info form is viewable with the GNU Emacs `info' subsystem, or the
stand-alone `info' program, available as part of the GNU Texinfo distribution.
To build the info files, you will need the `makeinfo' program. Type:
cd gas/doc
make info
Specifying names for hosts and targets
======================================
The specifications used for hosts and targets in the `configure'
script are based on a three-part naming scheme, but some short
predefined aliases are also supported. The full naming scheme encodes
three pieces of information in the following pattern:
ARCHITECTURE-VENDOR-OS
For example, you can use the alias `sun4' as a HOST argument or in a
`--target=TARGET' option. The equivalent full name is
`sparc-sun-sunos4'.
The `configure' script accompanying GAS does not provide any query
facility to list all supported host and target names or aliases.
`configure' calls the Bourne shell script `config.sub' to map
abbreviations to full names; you can read the script, if you wish, or
you can use it to test your guesses on abbreviations--for example:
% sh config.sub i386v
i386-unknown-sysv
% sh config.sub i786v
Invalid configuration `i786v': machine `i786v' not recognized
`configure' options
===================
Here is a summary of the `configure' options and arguments that are
most often useful for building GAS. `configure' also has several other
options not listed here.
configure [--help]
[--prefix=DIR]
[--srcdir=PATH]
[--host=HOST]
[--target=TARGET]
[--with-OPTION]
[--enable-OPTION]
You may introduce options with a single `-' rather than `--' if you
prefer; but you may abbreviate option names if you use `--'.
`--help'
Print a summary of the options to `configure', and exit.
`-prefix=DIR'
Configure the source to install programs and files under directory
`DIR'.
`--srcdir=PATH'
Look for the package's source code in directory DIR. Usually
`configure' can determine that directory automatically.
`--host=HOST'
Configure GAS to run on the specified HOST. Normally the
configure script can figure this out automatically.
There is no convenient way to generate a list of all available
hosts.
`--target=TARGET'
Configure GAS for cross-assembling programs for the specified
TARGET. Without this option, GAS is configured to assemble .o files
that run on the same machine (HOST) as GAS itself.
There is no convenient way to generate a list of all available
targets.
`--enable-OPTION'
These flags tell the program or library being configured to
configure itself differently from the default for the specified
host/target combination. See below for a list of `--enable'
options recognized in the gas distribution.
`configure' accepts other options, for compatibility with configuring
other GNU tools recursively; but these are the only options that affect
GAS or its supporting libraries.
The `--enable' options recognized by software in the gas distribution are:
`--enable-targets=...'
This causes one or more specified configurations to be added to those for
which BFD support is compiled. Currently gas cannot use any format other
than its compiled-in default, so this option is not very useful.
`--enable-bfd-assembler'
This causes the assembler to use the new code being merged into it to use
BFD data structures internally, and use BFD for writing object files.
For most targets, this isn't supported yet. For most targets where it has
been done, it's already the default. So generally you won't need to use
this option.
Compiler Support Hacks
======================
On a few targets, the assembler has been modified to support a feature
that is potentially useful when assembling compiler output, but which
may confuse assembly language programmers. If assembler encounters a
.word pseudo-op of the form symbol1-symbol2 (the difference of two
symbols), and the difference of those two symbols will not fit in 16
bits, the assembler will create a branch around a long jump to
symbol1, and insert this into the output directly before the next
label: The .word will (instead of containing garbage, or giving an
error message) contain (the address of the long jump)-symbol2. This
allows the assembler to assemble jump tables that jump to locations
very far away into code that works properly. If the next label is
more than 32K away from the .word, you lose (silently); RMS claims
this will never happen. If the -K option is given, you will get a
warning message when this happens.
REPORTING BUGS IN GAS
=====================
Bugs in gas should be reported to:
bug-binutils@gnu.org.
They may be cross-posted to gcc-bugs@gnu.org if they affect the use of
gas with gcc. They should not be reported just to gcc-bugs, since not
all of the maintainers read that list.
See ../binutils/README for what we need in a bug report.